N.O.
I've found out as soon as 2 weeks of being pregnant, and I've read that some tests will show a posotive 10 days after he "goes". : )
With all 4 of my pregnancies, I never had to wait until my missed period date to know, I always got a posotive, sometimes faint but at least a week before the date. And no matte what you hear, DO NOT spend fortunes on the expensive preg tests. All of my posotive tests were done with the cheapy tests, walmart has a 2-pack for just under $7 (sorry can't remember the name, orange box though) and Target has some cheap store brand ones that work just as good too.
When my sister got pregnant, she bought a $1 dollar tree test and it showed a posotive, took a little longer than the walmart brand but the posotive was there so any test you use, IF you're pregnant, will give you the posotive.
If you're trying and not pregnant yet, keep trying and have LOTS of sex, the more sex the more chances for you. Good luck and hope you get the outcome you wanted! : )